JPH1112925A - Alkali weight reduction processing method for polyester fabric - Google Patents

Abstract

(57) [Problem] To achieve a stable dyeing finish by preventing the occurrence of warp and horizontal stripes by preventing the sheath polyester fiber from cracking and the like. An alkali weight reduction method for a polyester fabric, comprising applying an alkaline solution to a fabric made of a hygroscopic core-sheath type composite polyester fiber and then performing a steaming heat treatment in a steam atmosphere.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reducing the alkali content of a polyester fabric and a method for producing a polyester fabric using the same. More particularly, the present invention relates to a method for reducing the amount of alkali in a fabric using a core-sheath type composite polyester fiber having hygroscopicity.

[0002]

2. Description of the Related Art Polyester fibers are widely used mainly in clothing and industrial applications because of their excellent shape stability, mechanical strength, chemical resistance, heat resistance, and washing durability.

[0003] However, since the polyester fiber has an extremely low moisture absorption, the greatest drawback is that it causes stuffiness and stickiness. In addition, since it tends to be charged and has a high frictional voltage, it has drawbacks such as easy clinging to the skin when worn, and in order to solve these drawbacks, polyesters obtained by copolymerizing various hydrophilic compounds are used. Composite polyester fibers are being studied.

[0004] The above-mentioned composite polyester fibers have different thermal swelling ratios between the polyester and the polyester obtained by copolymerizing the hydrophilic compound. Therefore, there is a problem that the polyester obtained by copolymerizing the polyester and the hydrophilic compound is separated during the dyeing and finishing step. Occurs. This phenomenon is particularly remarkable in a weight reduction process using a caustic soda solution. In the case of a core-sheath type composite polyester fiber comprising a polyester obtained by copolymerizing a hydrophilic compound as a core component and a polyester as a sheath component, when the weight is reduced, the core component thermally swells and the volume increases. The pressure inside the composite fiber increases and the surface side of the fiber begins to hydrolyze the polyester with the caustic soda solution.

[0005] Both actions cause cracks in the polyester of the sheath component (hereinafter referred to as "sheath cracks"). When the sheath crack occurs, the hydrophilic compound is eluted to the outside, and a vertical streak and a horizontal streak are generated, which causes a problem that the surface quality is significantly reduced.

[0006]

DISCLOSURE OF THE INVENTION The present invention overcomes the above-mentioned problems of the prior art, and prevents the occurrence of cracks in the sheath of a composite polyester fiber composed of a polyester obtained by copolymerizing a polyester and a hydrophilic compound. The object of the present invention is to eliminate the occurrence of horizontal stripes and achieve a stable dyeing finish.

[0007]

According to one aspect of the method for reducing the alkali content of a polyester fabric according to the present invention, an alkaline solution is applied to a fabric made of a hygroscopic core-sheath type composite polyester fiber, and then steamed in a steam atmosphere. This is an alkali weight reduction method for a polyester fabric subjected to heat treatment.

[0008] Further, the method for producing a polyester fabric of the present invention is a method for producing a polyester fabric, wherein the above-mentioned method for reducing the alkali content of a polyester fabric is used.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The composite polyester fiber used in the present invention is a core-sheath type composite polyester fiber containing one or more hygroscopic polymers obtained by copolymerizing polyester with other compounds.

As the polymer having hygroscopicity, copolymerized polyester, polyetheresteramide or a mixture of polyetheresteramide and another thermoplastic resin can be used, but as long as the effect is not impaired, polyolefin is used. , Polyamide, polyester, polycarbonate and the like.

For example, a hygroscopic polymer such as a copolyester, polyetheresteramide or a mixture of polyetheresteramide and another thermoplastic resin is used for the core portion, and a fiber-forming polymer is used for the sheath portion. Composite fibers and the like can be used.

As the fiber-forming polymer, polyethylene,
Polyolefins such as polypropylene, polyamides such as nylon 6 and nylon 66, polyesters such as polyethylene terephthalate and polybutylene terephthalate can be used, but are not limited thereto. It is preferable to use a polyester mainly composed of polyethylene terephthalate, which is the most versatile synthetic fiber for clothing. Further, in the fiber-forming polymer, titanium oxide, as long as the object of the present invention is not impaired,
Pigments such as carbon black, various antioxidants, anti-coloring agents, light-proofing agents, antistatic agents and the like may of course be added.

The form of the conjugate polyester fiber is not particularly limited, but a sea-island type core-sheath type composite fiber having a plurality of core components in one single fiber or a core-sheath type composite fiber having a hollow portion Etc. can be used. The core-sheath shape of the core-sheath type composite yarn may be concentric or eccentric, the fiber shape may be an irregular cross section such as a circle or a polygon, or a hollow portion may be present in a part of the core.

The composite ratio (% by weight) is as follows: core / sheath = 5/95
It is preferable to set it to 90/10. More preferably, 7/93 to 50/50, particularly preferably 10/90.
３０30/70. The composite ratio can be arbitrarily selected for dyeing use and non-dyeing use. The lower limit of the composite ratio of the core is appropriately set for the purpose of imparting sufficient hygroscopicity, and the upper limit is appropriately set from the viewpoint of preventing a decrease in spinnability and fiber properties.

The core-sheath composite polyester fiber used in the present invention has a hygroscopic property by containing the above-mentioned copolymerized polyester and the like. For example, a core-sheath composite yarn using 15% by weight of a polymer obtained by copolymerizing 90% by weight of polyetheresteramide and 10% by weight of polyethylene terephthalate in the core and 85% by weight of polyethylene terephthalate in the sheath is used. , M of 100% used fabric
R is 2.0%.

Here, ΔMR is represented by the difference between the moisture absorption rate (MR2) at 30 ° C. × 90% RH and the moisture absorption rate (MR1) at 20 ° C. × 65% RH (ΔMR (%) = M
R2-MR1) value. Here, ΔMR is a driving force for obtaining comfort by releasing moisture in the clothes when the clothes are worn to the outside air, and is 30 ° C. × 90% when light to medium work or light to medium exercise is performed. RH
, And the difference in moisture absorption between the outside temperature and humidity represented by 20 ° C. × 65% RH. In the present invention, this ΔMR is used as a parameter as a measure of the hygroscopicity evaluation. The larger the ΔMR, the higher the absorption / release output, indicating that the comfort during wearing is good.

One preferred embodiment of the core-sheath type composite polyester fiber is a polyester obtained by copolymerizing a hydrophilic compound as a core component, and has a hygroscopic property containing a polar group-containing compound and / or a crosslinking agent in an amount of 5% or more. A copolymerized polyester is used.

The molecular weight of the hydrophilic compound is preferably from 600 to 20,000 from the viewpoint of compatibility with the polyester and dispersibility in the polyester, more preferably from 1,000 to 10,000, further preferably from 2,000 to 6,000. It is.

The hydrophilic compound is preferably a compound containing one or more ester-forming groups, and is not particularly limited. Typical examples of the compound include polyoxyalkylene compounds, polyoxazolines, polyacrylamides and the like. Derivatives and the like can be used. Among them, polyoxyalkylene compounds are preferable, and polyoxyethylene compounds are more preferable.

Further, among the polyoxyethylene compounds, polyethylene glycol compounds are preferred, and polyethylene glycol containing a crystallization inhibitor is particularly preferred.

Here, the term "crystallinity inhibitor" refers to an organic residue which is present in the molecular chain or at the terminal and which disrupts the symmetry of the repeating unit of polyethylene glycol. Crystallization suppression refers to differential scanning calorimetry (DSC, heating conditions 16
C./min.) Means lower than the melting point of polyethylene glycol having the same molecular weight.

The ratio of copolymerization of the hydrophilic compound is not particularly limited, but is preferably 40 to 99% by weight based on the total polymer weight from the viewpoint of spinnability. 50
-95% by weight is more preferable, and 55-90% by weight is particularly preferable.

It is preferred that most of these compounds are copolymerized in the polyester, but some of them may be present in a dispersed state in the polymer.

Next, the polar group-containing compound contained in the copolymerized polyester is not particularly limited, but may be represented by the following general formula [I] (Yi —R ₁ —X _n ) [I] (wherein R ₁ is an organic residue, X is an ester-forming group and n
Represents one or more positive numbers, and Yi represents one or more polar groups selected from derivatives such as amino group, sulfone group, carboxyl group, hydroxyl group, amide group and phosphonic acid group. (I
(Integer of ≧ 1)) is preferable. As this compound, a compound having a sulfonate group is particularly preferable.

The polar group-containing compound may be either dispersed or copolymerized in the polyester, but is preferably in a copolymerized state.

The inclusion of the polar group-containing compound not only further increases the moisture absorption of the polymer, but also causes a hydrogen bond or an ionic interaction in the polymer, and hardly causes a change in physical properties over time when the fiber is used. The effect is obtained.

From the viewpoint of preventing the occurrence of thread breakage and making it difficult to cause a change with time, the content of the polar group-containing compound is from 0 to 50 mol% with respect to the acid component constituting the whole polymer.
And more preferably 2 to 30 mol%.
And particularly preferably 2 to 15 mol%.

The crosslinking agent contained in the copolymerized polyester is not particularly limited as long as it is a compound which reacts with the polyester to form a crosslinked structure, but the following general formula [II] (R ₃ O) _n R ₂ (COOR ₄ ) _m [II] (wherein R ₂ is a trivalent to hexavalent organic residue, R ₃ is hydrogen or acetyl group, R ₄ is hydrogen or alkyl group, 3 ≦ m +
It is preferable to use a polyfunctional compound represented by n ≦ 6).

The crosslinking agent may be in a state of being dispersed or copolymerized in the polyester, but is preferably in a state of having a crosslinked structure by copolymerization.

The compound is preferably a polyfunctional carboxylic acid such as trimellitic acid or pyromellitic acid, or a polyol such as glycerin, trimethylolpropane, or pentaeristol, and particularly preferably trimellitic acid. By containing a crosslinking agent, not only the hygroscopicity of the polymer is further enhanced, but also a crosslinked structure is formed in the polymer, and the effect of hardly causing a change in physical properties over time in the case of forming a fiber is obtained.

The proportion of the crosslinking agent is preferably from 0 to 30 mol%, more preferably from 1 to 15 mol%, particularly preferably from 2 to 10 mol%, based on the acid components constituting the whole polymer. When the content is in this range, the moisture absorption is kept high, the yarn forming property is improved, and the fiber properties such as strength are improved, which is preferable.

[0032] Copolymerized polyesters include pigments such as titanium oxide and carbon black, surfactants such as alkyl benzene sulfonate, various antioxidants, coloring inhibitors, and the like, as long as the object of the present invention is not impaired. Of course, a light stabilizer, an antistatic agent and the like may be added.

The thermal swelling ratio of the copolymer with the above-mentioned hydrophilic compound depending on the temperature is as shown in Table 1 below.

[0034]

[Table 1] The thermal swelling ratio as referred to herein is a value obtained by measuring a volume increase in the presence of water. Specifically, the sample was swelled by placing it in warm water for 2 hours, and the sample before and after swelling was pushed into a graduated cylinder filled with a fixed amount of water at 20 ° C., and the volume increase was calculated.

Next, another preferred embodiment of the core-sheath type composite polyester fiber is a hygroscopic material containing 5% or more of polyetheresteramide or a mixture of polyetheresteramide and another thermoplastic resin as a core component. Is used.

The term "polyetheresteramide" refers to a block copolymer having an ether bond and an ester bond in the same molecular chain.

More specifically, one or more polyamide-forming components selected from lactams, aminocarboxylic acids, salts of diamines and dicarboxylic acids, and poly (polyalkylene oxide) glycols composed of dicarboxylic acids and poly (alkylene oxide) glycols A block copolymer obtained by subjecting an ether ester-forming component to a polycondensation reaction can be preferably used.

As the polyamide-forming component, lactams, ω-aminocarboxylic acids, nylon salts and the like can be used, and these can be used alone or in combination of two or more. Preferred polyamide-forming components are epsilon caprolactam and nylon 66 salt.

On the other hand, as the polyetherester component, a dicarboxylic acid having 4 to 20 carbon atoms and poly (alkylene oxide) glycol are preferable.

As the dicarboxylic acid having 4 to 20 carbon atoms,
Aliphatic, aromatic dicarboxylic acids, alicyclic dicarboxylic acids, and the like can be used, and one kind or a mixture of two or more kinds can be used.

Preferred dicarboxylic acids are polyamide resins such as adipic acid and sebapolyglycine, and general-purpose thermoplastic resins such as polyester and polyolefin.
Terephthalic acid, isophthalic acid and the like.

As the poly (alkylene oxide) glycol, polyethylene glycol, poly (1,2)
-Propylene oxide) glycol, poly (1,3-propylene oxide) glycol, polytetramethylene oxide glycol, polyhexamethylene oxide glycol, ethylene oxide and propylene oxide or
Random or block copolymerization with tetrahydrofuran can be used, and polyethylene glycol is particularly preferred. The number average molecular weight of the poly (alkylene oxide) glycol is preferably from 300 to 10,000, more preferably from 500 to 4,000.

The polyetherester amide block copolymer can be obtained by polycondensing the above-mentioned polyamide-forming component and polyetherester-forming component.

Next, as the thermoplastic resin which can be mixed with the polyetheresteramide, for example, one or more of polyamides such as nylon 66 and nylon 6, polyester, and polyolefin can be used. . In particular, nylon 66, nylon 6, modified polyethylene terephthalate obtained by copolymerizing a sulfonate compound and the like are preferable because they have good compatibility with polyetheresteramide, can be finely dispersed in each other, and have a small swelling due to hot water. . Here, as a preferred sulfonate compound as a copolymerization component of the modified polyester,
It is possible to use 5-sodium sulfoisophthalic acid, 5- (tetraalkyl) phosphonium sulfoisophthalic acid and their ester derivatives, sodium p-hydroxyethoxybenzenesulfonate, potassium 2,5-bis (hydroxyethoxy) benzenesulfonate, and the like. it can. The copolymerization amount of this sulfonate compound is 0.1 to 7 mol% based on the acid component in consideration of the compatibility with the polyetheresteramide and the physical properties of the obtained blend fiber.
Is more preferably 0.2 to 6%, and still more preferably 0.5 to 5 mol%.

The mixing ratio between the polyetheresteramide and the thermoplastic resin is selected from the viewpoints of obtaining sufficient moisture absorption properties and preventing the fiber surface from cracking due to swelling in a hot water atmosphere such as a dyeing process. It is preferably from 5 to 50% by weight, more preferably from 7 to 45% by weight, even more preferably from 10 to 40% by weight.

Table 2 below shows the thermal swelling ratio of the above-mentioned polyetheresteramide depending on the temperature.

[0047]

[Table 2] In particular, in the case of a core-sheath composite fiber using the above-mentioned copolymer of polyetheresteramide and polyester for the core component and ordinary polyethylene terephthalate for the sheath component, the degree of thermal swelling of the core component as described above decreases as the temperature decreases. Although high, since the glass transition point of the sheath component polyester is 80 ° C., below this, the molecular motion is small and it is difficult for water to pass through the interior of the fiber. When the temperature becomes higher than the vicinity of the glass transition point, the molecular motion increases, and water easily passes through the inside of the fiber. As a result, the copolymer of the core component polyetheresteramide and the polyester undergoes thermal swelling, and the pressure inside the fiber increases. On the other hand, since the fiber surface is in contact with the alkali solution, sheath cracking occurs when the weight reduction processing time at 80 ° C to 100 ° C is long.

The polyester fabric used in the present invention is one in which the above-mentioned composite polyester fiber is used at least in part. The composite polyester fiber may be used for the warp yarn and the weft yarn may be mixed with ordinary polyester fiber, or may be used after mixing the composite polyester fiber and ordinary polyester fiber. Further, the cloth may be formed only with the composite polyester fiber.

The fabric may be in any form such as a woven fabric, a knitted fabric, or a non-woven fabric.

Next, the alkaline solution to be applied to the cloth includes an aqueous solution of an alkaline agent used for hydrolyzing the polyester. Caustic soda, caustic potash, cesium hydroxide, rubidium hydroxide,
There are sodium carbonate, potassium carbonate and the like, and caustic soda is preferable. The surface of the polyester fiber is eroded by hydrolysis with an alkali solution, decomposed into polyethylene glycol and sodium terephthalate or potassium terephthalate, and removed by dissolving in water. The concentration of the alkaline agent varies depending on the intended weight loss rate and the weight loss processing method used, but it is generally used at a concentration of 2 to 30% by weight. The present invention is not limited to this concentration. When the polyester fibers are thinned in the fabric by hydrolysis, voids are formed in the fabric, and the degree of freedom of the fabric is improved. Thereby, a soft and resilient hand is obtained. Many polyester garments are treated with this treatment. This process is usually called a weight reduction process.

The alkaline solution used in the weight reduction processing includes an anionic type, a cationic type and an alkaline type in order to uniformly reduce the weight of the entire fabric.
It is preferable to add a penetrant that has a fluorine activator such as a nonionic type and is stable against alkalinity, and a weight loss promoter such as an organic amine or a quaternary ammonium salt to promote the weight loss rate. As a penetrant, Neolate NA-
30, peneoline A and the like. Neorate NCB, DXK-10N, DYK-1
125 and the like.

Mechanically, the suspension kneading method, the Winning method,
In addition to liquid flow method, beam dyeing method, zicker method, etc., batch method such as cold batch long-time method, hot batch method, etc., and as connection type, alkaline bath pad steam method, alkaline bath pad hot cylinder baking method And the like are known and have advantages and disadvantages, but are widely used.

The rate of change in weight before and after the weight reduction processing is usually called the weight loss rate. The weight loss rate in the weight loss processing can be set arbitrarily according to the purpose. Usually, it is preferably 5 to 35%,
-20% is more preferable, and 5-15% is particularly preferable.

The term "in a steam atmosphere" as used in the present invention means that the relative humidity is 100% or less.

The relative humidity of the water vapor is not particularly limited, but is preferably 95% or more for the sake of controlling the humidity of the processing apparatus used. The temperature is desirably 100 ° C., but the temperature may be raised to about 130 ° C. using heated steam to prevent dew drop or the like. The steaming heat treatment of the present invention is to perform washing such as washing with hot water and water after applying the alkaline solution to the fabric, and is preferably a treatment of less than 10 minutes from the viewpoint of preventing sheath cracking and the like described above.

In order to reduce the weight in a short period of time, it is preferable to perform a series of processes by a connecting method.

By using the weight-reduction processing of the present invention, weight-reduction processing can be performed without causing sheath cracking. In particular, when an alkali solution is applied to a fabric using the above-mentioned core-sheath type composite polyester fiber and then microwave irradiation is performed in a steam atmosphere, hydrolysis proceeds more rapidly. The alkali solution is difficult to reach the core component by performing the time until washing with warm water in less than 10 minutes, and the internal pressure of the fiber does not increase by instantaneously rising to 100 ° C. by irradiating the microwave. Only the fiber surface can lose weight.

In the present invention, it is possible to add a penetrant for permeating the alkaline solution into the fiber surface layer to uniformly and uniformly reduce the weight of the entire fabric without weight loss processing unevenness, or to add a weight loss accelerator for rapidly completing the weight reduction. Here, the penetrant includes an activator of fluorine such as anionic, cationic, nonionic and the like, and a chemical stable to alkalinity can be used. As the weight loss accelerator, a nitrogen-containing compound such as a quaternary ammonium salt can be used. When a weight loss accelerator is used, an anion treatment may be performed as necessary.

[0059]

The present invention will be described below in more detail with reference to examples. In addition, each evaluation in this invention was calculated | required by the following method.

[Moisture Absorption and Desorption Parameters (ΔMR)] Using 1 to 3 g of the original yarn or cloth, the weight at the time of absolute drying and 20 ° C. × 65
% RH or a weight change from the weight after standing in a commercial thermo-hygrostat for 24 hours in an atmosphere of 30 ° C. × 90% RH, and was determined by the following equation.

Moisture absorption (%) = [(weight after moisture absorption−weight when absolutely dry) / weight when absolutely dry] × 100 20 ° C. × 65% RH and 30 ° C. × 90% measured above.
From the moisture absorption rate under the condition of RH (referred to as MR1 and MR2, respectively), a moisture absorption rate difference ΔMR (%) = MR2-MR1 was obtained.

[Tateji-Yokoshima] The finished fabric is subjected to an inspection machine, illuminated with fluorescent light from the back surface of the fabric, and evaluated with the naked eye.

W0: inconspicuous W1: slightly conspicuous W2: well conspicuous [Hand feeling] The texture of the fabric was evaluated by a sensory test by five experts for each of soft feeling, tight waist, and resilience, and the average value was used. The evaluation was divided into the following three stages.

：: good △: slightly problematic X: bad [sheath cracking test]: coloring with acid dye Composite polyester containing 5% or more of polyetheresteramide or a mixture of polyetheresteramide and another thermoplastic resin Only the polyester fabric using at least a part of the fiber was evaluated in four steps by the following method.

The above-mentioned cloth is put into a heat-resistant bat, and water 3
After adding 10 to 10 L (bath ratio 1:20 to 200), the temperature was raised to 80 ° C., an acidic dye (Disperse Red N-GZN) and acetic acid (0.5 g / l) were added, and the mixture was stirred for 10 minutes and cooled. afterwards,
After light washing, water was further added and the temperature was raised to 80 ° C, a surfactant (2 g / L) was added, and the mixture was stirred (twice) for 5 to 10 minutes, cooled, and then washed with hot water (60 ° C). × 5 minutes) and washing with water (room temperature × 5 minutes). The taken-out fabric was air-dried, sampled, and a single fiber was observed under a microscope for sheath cracks. If the core is dyed red, the sheath has cracked, and if it is not dyed, it has not occurred.

◎: Not dyed at all (no sheath cracking) ○: Hardly stained Δ: Slightly dyed ×: Dyeed well (with sheath cracking) [Example 1] 194 parts of dimethyl terephthalic acid, ethylene glycol 135 as copolymerized polyester Part, 5-
After adding 26.6 parts of sodium dimethyl sulphoisophthalate, 7.5 parts of trimethyl trimellitate and 0.1 part of tetrabutyl titanate and performing a transesterification reaction, 328 parts of polyethylene glycol having a molecular weight of 4000 were added, and polymerization was carried out. A copolymerized polyester was obtained.

Using the copolymerized polyester thus obtained as a core component and polyethylene terephthalate as a sheath component, melt spinning is performed using a core-sheath type composite spinneret so as to maintain a constant core-sheath area ratio (spinning temperature). 290 ° C, spinning speed 1350m / min), followed by drawing heat treatment (drawing temperature 80 ° C, drawing ratio 2.42 times, heat treatment temperature 150 ° C)
To form two types of composite filament yarn (50 denier 18 filament yarn and 75 denier 36 filament yarn) containing 20% by weight of the total weight of the fiber of the hygroscopic polymer having the performance of 29% moisture absorption. did. The 50-denier 18 filament yarn had a strength of 4.3 g / d and an elongation of 35%, and the 75-denier 36 filament yarn had a strength of 4.1 g / d and an elongation of 32%.

Using the obtained 50-denier 18-filament yarn as the warp and the 75-denier 36-filament yarn as the weft, a composite polyester taffeta having a green density of 97 yarns / inch and a weft density of 78 yarns / inch was woven.

Thereafter, scouring drying / intermediate setting is performed, and the film is immersed in a high-concentration aqueous solution of 20% caustic soda and a penetrant to a squeezing rate of 23%, and is filled in a room filled with steam at 105 ° C. for 3%.
After the treatment for 1 minute, the plate was washed for 5 seconds in a hot water washing tank (60 ° C.) and further washed for 3 minutes in two water washing tanks (40 ° C., room temperature). The weight loss rate was 8.1%. This fabric is dyed and finished to a density of 1
A composite polyester taffeta having a density of 07 pieces / inch and a weft density of 86 pieces / inch was obtained. Table 3 shows the evaluation results.

Permeating agent: Neolate NA-30 5 g / l (manufactured by Nika Chemical Co., Ltd.) Ionicity: anion Composition: special alkyl phosphate [Example 2] Polyester taffeta was obtained in the same manner as in Example 1. Thereafter, scouring drying / intermediate setting is performed, and the film is immersed in a high-concentration aqueous solution of 20% caustic soda and a penetrant, squeezed at 23%, and irradiated with microwaves (output 15 Kw) in a room filled with steam at 105 ° C. After treatment for 5 minutes, the plate is washed for 5 seconds in a hot water bath (60 ° C.) and two water baths (40 ° C.,
(Room temperature) for 3 minutes. The weight loss rate was 8.4%.
The woven fabric was dyed to obtain a composite polyester taffeta having a finishing density of 107 yarns / inch and a weft density of 86 yarns / inch.

Table 3 shows the evaluation results.

Example 3 As a copolymerized polyester,
194 parts of dimethyl terephthalic acid, ethylene glycol 1
35 parts, dimethyl 5-sodium sulfoisophthalate 2
After adding 6.6 parts, 7.5 parts of trimethyl trimellitate and 0.1 part of tetrabutyl titanate and performing a transesterification reaction, 328 parts of polyethylene glycol having a molecular weight of 4000 was added and polymerization was carried out to obtain a copolymerized polyester. Was.

Using the copolymerized polyester thus obtained as a core component, polyethylene terephthalate as a sheath component, and a core-sheath type composite hollow spinneret, a core-sheath having a 3% hollow portion in the core. Melt spinning is performed to maintain the area ratio (spinning temperature 290 ° C, spinning speed 1350m
/ Minute), and subsequently, a stretching heat treatment (a stretching temperature of 80 ° C., a stretching ratio of 2.42 times, and a heat treatment temperature of 150 ° C.) is performed to wind up, so that a hygroscopic polymer having a moisture absorption rate of 29% can be used to reduce the total weight of the fiber. Two types of composite filament yarn containing 20% by weight (50 denier 18 filament yarn and 7
5 denier 36 filament yarn). Note that 50
The strength of the denier 18 filament yarn was 4.2 g / d and the elongation was 36%, and the strength of the 75 denier 36 filament yarn was 4.1 g / d and the elongation was 33%.

Using the obtained 50 denier 18 filament yarn as the warp and 75 denier 36 filament yarn as the weft, a composite polyester taffeta having a greige density of 97 yarns / inch and a weft density of 78 yarns / inch was woven.

Thereafter, scouring drying / intermediate setting is performed, and the film is immersed in a high-concentration aqueous solution of 20% caustic soda and a penetrating agent, squeezed at 23%, and irradiated with microwaves (output 15 Kw) in a room filled with steam at 105 ° C. Then, after the treatment for 3 minutes, the substrate was washed in a hot water washing tank (60 ° C.) for 5 seconds, and further washed in two water washing tanks (40 ° C., room temperature) for 3 minutes. The weight loss rate is 8.
5% was obtained. The woven fabric was dyed to obtain a composite polyester taffeta having a finishing density of 107 yarns / inch and a weft density of 86 yarns / inch.

Table 3 shows the evaluation results.

Permeating agent: Same as in Example 1.

Example 4 340 parts of ε-caprolactam caprolactam, 18 parts of terephthalic acid, 100 parts of polyethylene glycol having a number average molecular weight of 1000, and “Irganox 1330” (manufactured by Ciba Geigy)
1 part and 0.01 part of trimethyl phosphate were charged into a polymerization reaction vessel, and heated and stirred at 240 ° C. for 1 hour under a nitrogen stream, and 0.1 part of antimony trioxide was added. The polymerization reaction was performed for 4 hours under the condition of 0.5 mmHg or less to obtain a polyetheresteramide block copolymer having a N6 component ratio of 45% by weight.

Using the polyetheresteramide block copolymer thus obtained as a core component and polyethylene terephthalate as a sheath component, melt spinning using a core-sheath type composite spinneret so as to maintain a constant core-sheath area ratio. (Spinning temperature: 285 ° C., spinning speed: 1350 m / min), followed by stretching heat treatment (drawing temperature: 80 ° C., stretching ratio: 2.6).
And a heat treatment temperature of 150 ° C.) to form a composite filament yarn containing 20% by weight of the total weight of the fiber of a hygroscopic polymer having a performance of 17%.
Seed (50 denier 18 filament yarn and 75 denier 3
6 filament yarn). In addition, 50 denier 18
Filament yarn strength is 4.8 g / d, elongation is 38%,
The strength of a 75 denier 36 filament yarn is 4.5 g /
d, elongation was 39%.

Using the obtained 50-denier 18-filament yarn as the warp and the 75-denier 36-filament yarn as the weft, a composite polyester taffeta having a green density of 97 yarns / inch and a weft density of 78 yarns / inch was woven.

Thereafter, scouring drying / intermediate setting is performed, and the film is immersed in a high-concentration aqueous solution of 20% caustic soda and a penetrant to a squeezing rate of 23%, and is filled in a room filled with steam at 105 ° C. for 3%.
After the treatment for 1 minute, the plate was washed for 5 seconds in a hot water washing tank (60 ° C.) and further washed for 3 minutes in two water washing tanks (40 ° C., room temperature). The weight loss rate was 8.3%. This fabric is dyed and finished to a density of 1
A composite polyester taffeta having a density of 07 pieces / inch and a weft density of 85 pieces / inch was obtained. Table 3 shows the evaluation results.

Permeating agent: Same as in Example 1 [Example 5] Polyester taffeta was obtained in the same manner as in Example 4, followed by scouring / intermediate setting to obtain a 20% caustic soda and a high concentration aqueous solution of a penetrating agent. In a room filled with water vapor at 105 ° C. with a squeezing rate of 23% and irradiated with microwaves (output 15 Kw), treated for 3 minutes, washed in a hot water washing tank (60 ° C.) for 5 seconds, and further washed in two tanks. Rinse tank (40 ° C,
(Room temperature) for 3 minutes. The weight loss rate was 8.2%.
The woven fabric was dyed to obtain a composite polyester taffeta having a finishing density of 107 / inch and a weft density of 85 / inch.

Table 3 shows the evaluation results.

[0084]

[Table 3] [Comparative Example 1] Using the same taffeta as in Example 1, scouring drying / intermediate setting of 50% of a 100% composite polyester taffeta cloth was carried out at 98 ° C while dipping in a 4% aqueous solution of caustic soda using a liquid jet dyeing machine. Treat at temperature for 70 minutes.
Thereafter, the substrate was washed twice with hot water (60 ° C.) for 10 minutes and further washed with water (room temperature) for 10 minutes. The weight loss rate was 8.8%. This fabric is dyed and finished to a density of 10
A composite polyester taffeta having 7 pieces / inch and a weft density of 86 pieces / inch was obtained.

Table 4 shows the evaluation results.

Comparative Example 2 Using the same taffeta as in Example 1, 50 m of a 100% composite polyester taffeta cloth subjected to scouring and drying / intermediate setting was subjected to ordinary dyeing finishing without reducing the weight and evaluated. The weight loss rate is 0%. The woven fabric was dyed to obtain a composite polyester taffeta having a finishing density of 107 yarns / inch and a weft density of 86 yarns / inch.

Table 4 shows the results of the evaluation.

Comparative Example 3 Using the same taffeta as in Example 4, a scouring / intermediate set of 100% composite polyester taffeta cloth 50m was immersed in a 4% aqueous solution of caustic soda using a liquid jet dyeing machine. Treat at a temperature of 98 ° C. for 70 minutes. Then, wash in hot water (60 ° C) for 10 minutes x 2
Washing was performed 10 times, followed by washing with water (room temperature) for 10 minutes. The weight loss rate was 8.9%. The woven fabric was dyed to obtain a composite polyester taffeta having a finishing density of 107 / inch and a weft density of 85 / inch.

Table 4 shows the evaluation results.

Comparative Example 4 Using the same taffeta as in Example 4, 50 m of a 100% composite polyester taffeta cloth subjected to scouring and drying / intermediate setting was subjected to ordinary dyeing finishing without reducing the weight, and evaluated. The weight loss rate is 0%. The woven fabric was dyed to obtain a composite polyester taffeta having a finishing density of 107 / inch and a weft density of 85 / inch.

Table 4 shows the evaluation results.

Comparative Example 5 ε-caprolactam 340
Parts, 18 parts of terephthalic acid, 100 parts of polyethylene glycol having a number average molecular weight of 1000, 0.1 part of "Irganox 1330" (manufactured by Ciba Geigy) and 0.01 part of trimethyl phosphate, and charged into a polymerization reaction vessel. After heating and stirring at 240 ° C. for 1 hour, 0.1 part of antimony trioxide was added, and a polymerization reaction was carried out at 250 ° C. and 0.5 mmHg or less for 4 hours under a heating / decompression program to obtain an N6 component. A polyetheresteramide block copolymer having a ratio of 45% by weight was obtained.

Using the polyetheresteramide block copolymer thus obtained as a core component, polyethylene terephthalate as a sheath component, and a core-sheath type composite hollow spinneret, a core portion having a hollow portion of 3% was used. Then, melt spinning (spinning temperature: 285 ° C., spinning speed: 1350 m / min) is performed so as to maintain a constant core-sheath area ratio, followed by drawing heat treatment (drawing temperature: 80 ° C., drawing ratio: 2.6 times, heat treatment temperature: 15 times).
0 ° C.) and take up to obtain 20% by weight of the hygroscopic polymer having a moisture absorption rate of 17% of the total weight of the fiber.
2 types of composite filament yarn (50 denier 1
8 filament yarn and 75 denier 36 filament yarn)
Produced. The strength of the 50 denier 18 filament yarn was 4.7 g / d and the elongation was 34%, and the strength of the 75 denier 36 filament yarn was 4.6 g / d and the elongation was 36%.

Using the obtained 50-denier 18-filament yarn as the warp and the 75-denier 36-filament yarn as the weft, a composite polyester taffeta having a greige density of 97 yarns / inch and a weft density of 78 yarns / inch was woven.

Thereafter, scouring drying / intermediate setting is performed,
0 m was treated at a temperature of 98 ° C. for 70 minutes while dipping in a 4% aqueous solution of caustic soda using a jet dyeing machine. Thereafter, the substrate was washed twice with hot water (60 ° C.) for 10 minutes and further washed with water (room temperature) for 10 minutes. Weight loss rate is 8.8
%. The woven fabric is dyed and finished to a density of 107 /
A composite polyester taffeta having an inch and a weft density of 85 strands / inch was obtained.

Table 4 shows the evaluation results.

[0097]

[Table 4] From the above results, as a means of eliminating sheath cracking, warp and Yokomura defects, and obtaining a high moisture absorption rate, high concentration treatment of caustic soda, high temperature treatment in the treatment chamber, microwave irradiation treatment, etc. are effective. When the microwave irradiation treatment is performed, the temperature in the treatment chamber can be raised at a stretch, so that the fiber surface can be reduced before the hydrophilic compound swells and causes sheath cracking.

[0098]

According to the present invention, it is possible to overcome the problems of the prior art, to have a large moisture absorption rate and a soft feeling, and to eliminate the sheath cracks caused by swelling inside the moisture-absorbing polyester, thereby obtaining a characteristic of polyester. This is an alkali weight reduction processing method having both stability and strength retention and capable of obtaining a moisture absorption of ΔMR = 2% or more.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Masaru Haruta 1-1-1 Oe, Otsu City, Shiga Prefecture Toray Industries, Inc. Seta Plant

Claims (9)

[Claims] 1. A method for reducing the alkali content of a polyester fabric, comprising applying an alkaline solution to a fabric made of a hygroscopic core-sheath composite polyester fiber, and then subjecting the fabric to a steaming heat treatment in a steam atmosphere. 2. The method according to claim 1, wherein microwaves are irradiated in the steaming heat treatment. 3. The copolymer according to claim 1, wherein the hygroscopic core-sheath conjugated polyester fiber is a polyester obtained by copolymerizing a hydrophilic compound and contains a polar group-containing compound and / or a crosslinking agent. A method for reducing the alkali weight of a polyester fabric, wherein the core component contains 5% or more of polyester. 4. A method according to claim 3, wherein the maximum value of the thermal swelling ratio of the hydrophilic compound is less than 100 ° C. 5. The core-sheath type composite polyester fiber according to claim 1, wherein the core component contains 5% or more of polyetheresteramide or a mixture of polyetheresteramide and another thermoplastic resin in the core component. A method for reducing the alkali weight of a polyester fabric, characterized by comprising: 6. The polyester fabric according to claim 5, wherein the maximum value of the thermal swelling ratio of the polyetheresteramide or a mixture of the polyetheresteramide and another thermoplastic resin is less than 100 ° C. Alkali weight loss processing method. 7. A method according to claim 1, wherein said alkaline solution contains a penetrant or a weight loss accelerator. 8. A method according to claim 1, wherein said moisture-absorbent core-sheath composite polyester fiber has a hollow portion. 9. A method for producing a polyester fabric, comprising subjecting the polyester fabric to the alkali weight reduction process according to any one of claims 1 to 8.